Questions tagged [twins]

Children born from the same pregnancy. Twins can result from either a single zygote (monozygotic, or identical twins) or from two, separately-fertilized egg cells (dizygotic, or fraternal twins).

Filter by
Sorted by
Tagged with
1 vote
1 answer
386 views

Twin with one boy and one girl with single placenta

I am 27,male and just become father of twins. One baby boy and one baby girl. According to my wife’s medical report both of the babies were sharing a single placenta. I am not an expert in medical ...
Saruque Ahamed Mollick's user avatar
0 votes
1 answer
184 views

Is heritability just slope?

Is broad-sense heritability just the slope of the line that passes through the coordinates: (1, The phenotypic correlation among monozygotic twins) (0.5, The phenotypic correlation among dizygotic ...
BigMistake's user avatar
0 votes
1 answer
1k views

How common are boy, girl twins?

In the human population, if you meet someone how likely are they to be a twin with someone of opposite sex? That includes non-twins, not just people who are twins.
Haydee's user avatar
  • 19
0 votes
0 answers
169 views

What happens to quality of breast milk when twins of two different sexes are born?

It says here in Scientific American Mother's milk may be the first food, but it is not created equal. In humans and other mammals, researchers have found that milk composition changes depending on ...
Profile name's user avatar
0 votes
0 answers
390 views

Using the law of independent assortment, why can't heterozygous parents make identical twins?

In a case where two parents are heterozygous, why can't any pairs of their children be identical twins? As the question asks, I tried to explain this using the law of independent assortment, which ...
John Liu's user avatar
  • 109
9 votes
0 answers
289 views

The village of Twins — Mystery behind and Scope

With the presence of more than 200 twins, Kodinhi , a village situated in Malappuram District in Kerala , India , is popularly known as the "Village of Twins".This phenomenon of large ...
Asmi's user avatar
  • 123
0 votes
1 answer
117 views

Can 2 eggs come from ONLY 1 ovary? [closed]

I only have 1 ovary due to previous pregnancy and was told that, that pregnancy was a twin pregnancy. I know I can have identical twins but I wanna know the odds of fraternal twins.
Cassie M's user avatar
-1 votes
2 answers
250 views

Do identical twins have the same metabolism rate at birth? [closed]

Will monozygotic twins defecate at the same time if fed at the same time during the first weeks of life? They should have the same genetics (and epigenetics) since they are monozygotic and the same ...
Hachiloni's user avatar
  • 973
1 vote
1 answer
131 views

Monozygotic vs Dizygotic heteropaternal superfecundation

Update: I had a wrong assumption. After triple checking, I now see that how ordinary monozygotic twins arise is 1 sperm and 1 ovum and then later the zygote splits up. (1.1. and that that phil and ...
BCLC's user avatar
  • 93
0 votes
1 answer
163 views

Can twins that develop in separate sacs but share the same placenta be identical?

I have two younger non identical twin sisters. When my mum was pregnant she was told they were both in different sacs when developing but shared the same placenta. We have done hours of research on ...
liv beckley's user avatar
1 vote
1 answer
172 views

What exactly does the phrase "chimerical sharing" mean in this abstract?

The Gizmodo article Australian Siblings Are Semi-Identical Twins, Some of the Rarest Humans Ever links to the new paper in NEJM Molecular Support for Heterogonesis Resulting in Sesquizygotic Twinning ...
uhoh's user avatar
  • 5,486
1 vote
0 answers
53 views

How can twins be born months apart? [closed]

How can twins be born months apart? What is the science behind it?
Lila's user avatar
  • 11
7 votes
3 answers
2k views

Peach pits with two seeds: Are the seeds identical twins?

I have Prunus persica peach pits that have two seeds. My question is simple: Do the seeds have the same DNA? (are they identical twins?)
User1974's user avatar
  • 852
0 votes
1 answer
3k views

What percentage of twins has the same gender

If 30% of all twins are identical twins, what percentage of twins has the same gender? I thought: all identical twins have the same gender so it’s at least 30%. And of the non-identical twins it’s ...
Mett123's user avatar
2 votes
0 answers
4k views

Do the eggs of fraternal twins come from the same ovary?

With fraternal twins two matured eggs are released and fusion of the two with sperms result in formation of these fraternal twins. Then do the two matured eggs come from one ovary or both the ovaries ...
Lily Twilight's user avatar
2 votes
0 answers
106 views

How to determine if twins are identical or fraternal if only one is alive?

I had a twin brother who died at birth. I've missed him all my life, and have been curious to know if we were identical or fraternal. Is there a test to determine whether we were identical or ...
user avatar
1 vote
1 answer
64 views

Are hormone secretion variations the same for a pair of monozygotic twins?

I have recently read a paper about how stress affects morning salivary cortisol levels in an individual. I am conducting a study on monozygotic twins and was wondering if cortisol levels would ...
user44601's user avatar
-1 votes
1 answer
627 views

Why was the study of "Concordance of Monozygotic and Dizygotic twins for traits" designed in this way? [closed]

I am confused by the twin study 'Concordance of Monozygotic and Dizygotic twins for traits.' My questions arose from 3:17-4:17 of the video And this is the related data I have referred I have ...
Snake's user avatar
  • 99
2 votes
1 answer
389 views

How does the genetic material differ between dizygotic twins and ordinary siblings?

I am going to give a rough presentation on twin studies. The terms heritability and concordance are included already, but I struggle with understanding the difference of the genetic material of ...
Tacticus's user avatar
  • 123
0 votes
0 answers
90 views

Phenotype choice for one of a MZ twin pair in a genetic association study

I was having a discussion with a colleague and this question came up... It is commonplace in molecular genetics studies to only genotype one of a pair of monozygotic twins (and then implicitly impute ...
Joni's user avatar
  • 136
0 votes
1 answer
459 views

Is "Cisternal Twins" an actual classification of twin types and if so, describe it

I always assumed my brother and I were identical twins. Now my mother, in her eighties, says we are cisternal twins, but I cannot find any references on the matter. Is there such a thing? If so, what ...
Riverborne's user avatar
67 votes
2 answers
11k views

Can a woman give birth to twins with different fathers?

Is it possible for a woman to conceive from two different men and give birth to half-siblings?
Probably's user avatar
  • 2,438
4 votes
2 answers
4k views

The sex of the offspring of twins?

Given identical twin males, Michael and Douglas, Douglas and his wife have four children, all of whom are girls. Michael and his wife have only one child, a boy, and are expecting another. What are ...
Michael Price's user avatar
17 votes
2 answers
9k views

Do identical twins have the same fingerprint?

When there is every thing same from their genes to their phenotype so then why they don't have same fingerprints?
user4147's user avatar
  • 2,159
2 votes
1 answer
563 views

Is a double-yolk egg capable of producing two viable chicks?

As per title: If fertilized, is a double-yolk egg capable of producing two viable chicks (that could survive to adulthood)? Have there been any reported cases of such (presumably) fraternal twins?
Bohemian's user avatar
  • 683
2 votes
2 answers
962 views

Why will tissue from identical twin be rejected in some cases?

Also, transplants from one identical twin to another are almost never rejected. [ Source: Medline Plus ] Why can a tissue from an identical twin be rejected ?
biogirl's user avatar
  • 8,601
4 votes
1 answer
741 views

Identical twins' biological sexes

Can identical twins have different genders (as in biological sex)? I thought they should have absolutely the same genes. If they can, what caused it? I'd assume it MAY be because of errors in ...
Wajih Aziza's user avatar
1 vote
0 answers
72 views

Which disorders are fully concordant?

I work in neuroscience, mostly Alzheimer's disease (AD), with some work in autism spectrum disorder (ASD). The work is in gene regulation and epigenomics. I'm familiar with monozygotic twin (MZ) ...
Bryan's user avatar
  • 161
3 votes
1 answer
167 views

Is there a limit to twinning?

Can developing twins further divide and subdivide and become identical quadruplets or octuplets or...? Can twinning be induced, either in utero or in vitro? Might it be possible to just keep ...
Outboxman's user avatar
3 votes
2 answers
1k views

When does identical twinning happen?

What is the window during which division into twins is possible (for instance can it still happen after implantation in the uterus)? Is one twin the "original" and the other its clone?
Outboxman's user avatar
5 votes
2 answers
1k views

Are identical twins exactly the same?

http://www.scientificamerican.com/article.cfm?id=identical-twins-genes-are-not-identical According to this article some identical twins show differences with respect to their copy number variants. ...
biogirl's user avatar
  • 8,601